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Old 10-15-2014, 06:39 PM
 
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Median U-Turn Intersection - Informational Guide
http://www.virginiadot.org/FHWA-SA-1...onal_Guide.pdf
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Old 10-15-2014, 07:04 PM
 
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Probably for intersections where left turn volume is low, otherwise you would have backups behind the U turn point. Definitely not where there are dual left turn lanes. Note: I am not a traffic engineer.
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Old 10-15-2014, 08:21 PM
 
Location: The City
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Isnt a jug handle a better version of this, or can handle more volume
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Old 10-15-2014, 10:47 PM
 
409 posts, read 388,894 times
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Quote:
Originally Posted by kidphilly View Post
Isnt a jug handle a better version of this, or can handle more volume
The jughandle is another example of an alternative intersection that features indirect left turns. However, a typical jughandle still allows direct left turns to be made from the minor-street. An additional signal phase may be needed to accommodate minor-street left-turn movements which reduces total intersection capacity.
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Old 10-16-2014, 08:33 AM
 
409 posts, read 388,894 times
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Quote:
Originally Posted by pvande55 View Post
Probably for intersections where left turn volume is low, otherwise you would have backups behind the U turn point. Definitely not where there are dual left turn lanes. Note: I am not a traffic engineer.

Double left turn lanes can be included at the turnaround signal if left turn volumes are high. That being said, it's ideal to have lower left turn volumes since this is the movement that is inconvenienced. Here's an example of a turnaround with double left turn lanes:

https://maps.google.com/maps?ll=42.5...classic&dg=brw
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Old 10-16-2014, 07:29 PM
 
2,553 posts, read 2,004,486 times
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Quote:
Originally Posted by impala096 View Post
Double left turn lanes can be included at the turnaround signal if left turn volumes are high. That being said, it's ideal to have lower left turn volumes since this is the movement that is inconvenienced. Here's an example of a turnaround with double left turn lanes:

https://maps.google.com/maps?ll=42.5...classic&dg=brw
But, overall it would seem to require fewer signal phases at the main intersection, thereby allowing higher traffic volume. Or, at least, for flow to be less stuttered.
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Old 10-16-2014, 09:12 PM
 
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This looks like you're referring to the dreaded "Michigan left turn".
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Old 10-20-2014, 06:32 PM
 
409 posts, read 388,894 times
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One advantage of the "Michigan Left" is improved signal progression. Below are some examples of Median-U-Turn corridors where drivers enjoy an endless "wave" of green lights.





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Old 10-21-2014, 01:36 PM
Status: "Summer!" (set 17 days ago)
 
Location: Foot of the Rockies
86,992 posts, read 102,568,112 times
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Quote:
Originally Posted by mjlo View Post
This looks like you're referring to the dreaded "Michigan left turn".
Is that like the "Pittsburgh left" where people turn left in front of oncoming traffic?
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Old 10-21-2014, 02:40 PM
 
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Quote:
Originally Posted by Katiana View Post
Is that like the "Pittsburgh left" where people turn left in front of oncoming traffic?
No. In the Michigan left, you make a right turn at the road you want to go left and then make a u-turn to continue in the direction you desire. The Michigan Left eliminates left turn.
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